Opened 11 years ago
Last modified 7 years ago
#2428 new defect
numerical instability
Reported by: | wbraun | Owned by: | somebody |
---|---|---|---|
Priority: | high | Milestone: | Future |
Component: | Run-time | Version: | trunk |
Keywords: | Cc: |
Description (last modified by wbraun)
Following model behaves numerical instable:
loadString(" model testCFExpr1 Real x; initial equation der(x) = 3.14159/2; equation sin(der(x)) = cos(x); end testCFExpr1; "); simulate(testCFExpr1, stopTime=10, tolerance=1e-4); val(x,0); val(x,10); val(der(x),0); val(der(x),10); simulate(testCFExpr1, stopTime=10, tolerance=1e-5); val(x,0); val(x,10); val(der(x),0); val(der(x),10); simulate(testCFExpr1, stopTime=10, tolerance=1e-6); val(x,0); val(x,10); val(der(x),0); val(der(x),10); simulate(testCFExpr1, stopTime=10, tolerance=1e-7); val(x,0); val(x,10); val(der(x),0); val(der(x),10); simulate(testCFExpr1, stopTime=10, tolerance=1e-8); val(x,0); val(x,10); val(der(x),0); val(der(x),10);
results with different tolerances:
tolerance = 0.0001: -0.000001326803844565571 1.5707084777514067 1.570795 0.00008784904348996832 tolerance = 0.00001: -0.000001326803844565571 1.5707236871192907 1.570795 0.00007263967560595125 tolerance = 0.000001: -0.000001326803844565571 526.3524099363941 1.570795 18.985196381642503 tolerance = 0.0000001: -0.000001326803844565571 1.570724934665874 1.570795 0.00007139212902257958 tolerance = 0.00000001: -0.000001326803844565571 183.5349266542149 1.570795 0.24824358078800488
Attachments (1)
Change History (10)
Changed 11 years ago by wbraun
comment:1 Changed 11 years ago by wbraun
- Description modified (diff)
comment:2 Changed 10 years ago by sjoelund.se
- Milestone changed from 1.9.1 to 1.9.2
comment:3 Changed 10 years ago by sjoelund.se
- Milestone changed from 1.9.2 to 1.9.3
Milestone changed to 1.9.3 since 1.9.2 was released.
comment:4 Changed 9 years ago by sjoelund.se
- Milestone changed from 1.9.3 to 1.9.4
Moved to new milestone 1.9.4
comment:5 Changed 9 years ago by sjoelund.se
- Milestone changed from 1.9.4 to 1.9.5
Milestone pushed to 1.9.5
comment:6 Changed 9 years ago by sjoelund.se
- Milestone changed from 1.9.5 to 1.10.0
Milestone renamed
comment:7 Changed 8 years ago by sjoelund.se
- Milestone changed from 1.10.0 to 1.11.0
Ticket retargeted after milestone closed
comment:8 Changed 8 years ago by sjoelund.se
- Milestone changed from 1.11.0 to 1.12.0
Milestone moved to 1.12.0 due to 1.11.0 already being released.
comment:9 Changed 7 years ago by casella
- Milestone changed from 1.12.0 to Future
The milestone of this ticket has been reassigned to "Future".
If you think the issue is still valid and relevant for you, please select milestone 1.13.0 for back-end, code generation and run-time issues, or 2.0.0 for front-end issues.
If you are aware that the problem is no longer present, please select the milestone corresponding to the version of OMC you used to check that, and set the status to "worksforme".
In both cases, a short informative comment would be welcome.
This ticket was not closed for 1.9.1, which has now been released. It was batch modified for milestone 1.9.2 (but maybe an empty milestone was more appropriate; feel free to change it).